FIG. 2.

Comparison of tetanic tension produced by stimulation of whole IO nerve and the sum of tensions of each IO branch stimulated separately. A: group means ± SE for each frequency of stimulation of IO with supramaximal current intensity (twitch responses to stimulation pulses at 1 Hz and to pulse trains of 50- to 220-Hz frequency). All data point differences are significant (P < 0.05). B: group means ± SE of muscle responses to 200-Hz stimulation with supra- and submaximal current intensity. Supramaximal, but not submaximal, current intensity resulted in significant tension excess (*P < 0.05).